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• Change background colour of individual elements on the fly

  - by John

  Hi, Is there a way in CSS or JQuery where I can dynamically change the background of li tags so they get slightly lighter for each element until it gets to white. For example say I had a list of 10 li elements. The first would have a red (#ff0000) background, the next one would then be a lighter shade of red, and so on and so on until we got to the last one which would have a background of white (#FFFFFF) The list can be any length and i just want the background colour to go from one colour e.g. red to another colour e.g. white. My site uses JQuery so if I have to use that I don't mind. Thanks

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• jQuery - OnClick, change background color for table cells

  - by andrew

  Hi all, Let me show you a demo: here it is working for only rows. its not working for cells. i want to change cells' (tds') background colors with mouse clicks. For example: a have a table, and it has 4 tds. table's background color is white. if i click to a td, a td should be red, than if i click to b, b td should be red and a td should be white again. if i click to c than, c should be red and b should be white right now. A - B C - D Can anyone help me?

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• Loop colours from variables for graphics.py [Python 3.2]

  - by user1056548

  I am creating a graphics program that draws 100 x 100 squares next to each other depending on the user-specified grid size. The user also inputs 4 colours for the squares to be coloured (e.g. if they enter red,green,blue,yellow the squares will be coloured in that order, repeating the colours). Is it possible to loop the colours from the variables the user has given? Here is what I have so far: def main(): print ("Please enter four comma seperated colours e.g.: 'red,green,blue,yellow'\n\ Allowed colours are: red, green, blue, yellow and cyan") col1, col2, col3, col4 = input("Enter your four colours: ").split(',') win = GraphWin ("Squares", 500, 500) colours = [col1, col2, col3, col4] drawSquare (win, col1, col2, col3, col4, colours) win.getMouse() win.close() def drawSquare(win, col1, col2, col3, col4, colours): for i in range (4): for j in range (len(colours)): colour = colours[j] x = 50 + (i * 50) circle = Circle (Point (x,50), 20) circle.setFill(colour) circle.draw(win) I think I should be using a list in some way, but can't work out exactly how to do it. Can anybody help?

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• C/C++ enum and char * array

  - by Eric M

  Ran accross the following code in an article and didn't think it was standard C/C++ syntax for the char* array. As a test, both Visual C++ (visual studio 2005) and C++ Builder Rad XE both reject the 2nd line. Without using #defines, anyone have any tricks/tips for keeping enums and a string array sort of in sync without resorting to STL ? More of a curiosity question. enum TCOLOR { RED, GREEN, BLUE }; char *TNCOLOR[] = { [RED]="Red", [GREEN]="Green", [BLUE]="Blue" }; as an aside, the article this came from is quite old and I believe this might work under GCC but have not tested.

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• Changing the tint of a bitmap while preserving the overall brightness

  - by MusiGenesis

  I'm trying to write a function that will let me red-shift or blue-shift a bitmap while preserving the overall brightness of the image. Basically, a fully red-shifted bitmap would have the same brightness as the original but be thoroughly red-tinted (i.e. the G and B values would be equal for all pixels). Same for blue-tinting (but with R and G equal). The degree of spectrum shifting needs to vary from 0 to 1. Thanks in advance.

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• Using Cases to change background colour | Visual Studio 2008

  - by Simon

  I really need help working with cases, I'm only learning it so far, but just can't get a drop down menu to work that would change the background of a Textbox. Private Sub cbColours_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cbColours.SelectedIndexChanged Select Case colours Case Is = "Red" txtSpace.BackColor = Color.Red Case Is = "Blue" txtSpace.BackColor = Color.Blue Case Is = "Green" txtSpace.BackColor = Color.Green End Select End Sub It isn't doing anything at all... In the dropdown menu, it has Red, Blue and Green one per line When the value (e.g. Green) is clicked, it will then change the Textbox to the colour selected. Many help appreciated :)

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• jquery .add() is weird

  - by phil

  Hi folks. Why all elements turn red? I only intend to turn <p> red. <ul> <li>list item 1</li> <li>list item 2</li> <li>list item 3</li> </ul> <p>a paragraph</p> <script> $('li').add('p').css('background-color', 'red'); </script>

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• Database table design vs. ease of use.

  - by Gastoni

  I have a table with 3 fields: color, fruit, date. I can pick 1 fruit and 1 color, but I can do this only once each day. examples: red, apple, monday red, mango, monday blue, apple, monday blue, mango, monday red, apple, tuesday The two ways in which I could build the table are: 1.- To have color, fruit and date be a composite primary key (PK). This makes it easy to insert data into the table because all the validation needed is done by the database. PK color PK fruit PK date 2.- Have and id column set as PK and then all the other fields. Many say thats the way it should be, because composite PKs are evil. For example, CakePHP does no support them. PK id color fruit date Both have advantages. Which would be the 'better' approach?

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• jQuery drag and drop behavior with partially transparent image

  - by Aaron

  I'm trying to develop a drag-and-drop behavior based on the jQuery UI draggable behavior but am running into some road blocks. I want to be able to drag several images with transparent regions around a region of the screen. I want the user to be able to drag the image he clicks and not just whatever draggable div or PNG happens to be z-indexed on top. The below image is a screen grab from my test page. If I click the lower left region of the blue square through the red thing I should drag the square and not the red thing. The red thing is what gets dragged though because it is on top and the browser does not care about the transparency. My question is, how can I make it behave as expected in this situation and drag the square instead? Edit: Seems I can't attach images as a new user. See this URL for my example image: http://i42.tinypic.com/r1g4sk.png

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• C# Custom Brush - I want two gradients chaining them together.

  - by Logan

  I am making a bar chart and I want two separate gradients for each bar. First I want a gradient to go from top to bottom solid red to transparent red. I want to paint over the top of that a gradient that goes from right to left, black to opaque. So - In the bottom left we should have; Bottom left - Alpha 0 Bottom right - Alpha 0 Top left - Alpha 255 Colour Red Top Right - Alpha 255 Colour Black So in effect I want to take a solid colour, add a left to right gradient to black then take the output of that and add a top to bottom gradient to transparency. All this and I want it to be in a single brush, is this even possible? Thanks!

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• Separating an Array into a comma seperated string with quotes

  - by user548744

  I'm manually building an SQL query where I'm using an Array in the params hash for an SQL IN statement, like: ("WHERE my_field IN('blue','green','red')"). So I need to take the contents of the array and output them into a string where each element is single quoted and comma seperated (and with no ending comma). So if the array was: my_array = ['blue','green','red'] I'd need a string that looked like: "'blue','green','red'" I'm pretty new to Ruby/Rails but came up with something that worked: if !params[:colors].nil? @categories_array = params[:colors][:categories] @categories_string ="" for x in @categories_array @categories_string += "'" + x + "'," end @categories_string.chop! #remove the last comma end So, I'm good but curious as to what a proper and more consise way of doing this would look like? Thanks

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• Is there a name for this type of algorithm?

  - by rehanift

  I have a 2 dimensional array forming a table: [color][number][shape ] ------------------------- [black][10 ][square ] [black][10 ][circle ] [red ][05 ][triangle] [red ][04 ][triangle] [green][11 ][oval ] and what I want to do is group largest common denominators, such that we get: 3 groups group #1: color=black, number=10, shapes = [square, circle] group #2: color=red, shape=triange, numbers = [05,04] group #3: color=green, number=11, shape = oval I wrote code that will handle a 2 "column" scenario, then I needed to adjusted it for 3 and I was figuring I might as well do it for n. I wanted to check first if there is some literature around this but I can't think of what to start looking for!

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• Stable separation for two classes of elements in an array

  - by AndreyT

  Consider the following problem. We are given an array of elements belonging to one two classes: either red or blue. We have to rearrange the elements of the array so that all blue elements come first (and all red elements follow). The rearrangement must be done is stable fashion, meaning that the relative order of blue elements must be preserved (same for red ones). Is there a clever algorithm that would perform the above rearrangement in-place? A non-in place solution is, of course, straightforward. An obvious in-place solution would be to apply any stable sorting algorithm to the array. However, using a full-fledged sorting algorithm on an array intuitively feels like an overkill, especially taking into account the fact that we are only dealing with two classes of elements. Any ideas greatly appreciated.

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• Custom Brush - I want two gradients chaining them together.

  - by Logan

  I am making a bar chart and I want two separate gradients for each bar. First I want a gradient to go from top to bottom solid red to transparent red. I want to paint over the top of that a gradient that goes from right to left, black to opaque. So - In the bottom left we should have; Bottom left - Alpha 0 Bottom right - Alpha 0 Top left - Alpha 255 Colour Red Top Right - Alpha 255 Colour Black So in effect I want to take a solid colour, add a left to right gradient to black then take the output of that and add a top to bottom gradient to transparency. All this and I want it to be in a single brush, is this even possible?

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• WPF. Can I dinamically make part of the TextBlock.Text to different colour?

  - by Bobb

  I have TextBlock in my main form. I set the Text property to different strings during the application run. I would like to be able to colour parts of particular strings. Say (pseudo-code) if(a < 0) txbStatus.Text = string.Format("{0} <RED>{1}</RED>", a, b); else txbStatus.Text = string.Format("{0} <BLUE>{1}</RED>", a, b);

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• How to display and change an icon inside a python Tk Frame

  - by codingJoe

  I have a python Tkinter Frame that displays several fields. I want to also add an red/yellow/green icon that will display the status of an external device. The icon is loaded from a file called ICON_LED_RED.ico. How do I display the icon in my frame? How do I change the icon at runtime? for example replace BitmapImage('RED.ico') with BitmapImage('GREEN.ico') class Application(Frame): def init(self, master=None): Frame.__init__(self, master) self.pack() self.createWidgets() def createWidgets(self): # ...other frame code.. works just fine. self.OKBTN = Button(self) self.OKBTN["text"] = "OK" self.OKBTN["fg"] = "red" self.OKBTN["command"] = self.ok_btn_func self.OKBTN.pack({"side": "left"}) # when I add the following the frame window is not visible # The process is locked up such that I have to do a kill -9 self.statusFrame = Frame(self, bd=2, relief=RIDGE) Label(self.statusFrame, text='Status:').pack(side=LEFT, padx=5) self.statIcon = BitmapImage('data/ICON_LED_RED.ico') Label (self.statusFrame, image=self.statIcon ).grid() self.statusFrame.pack(expand=1, fill=X, pady=10, padx=5)

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• how to set length and postion for repeat-x and scroll background-image?

  - by user550945

  Hi all, I have an to set background image. it is a red line under the input value. background-attachment:scroll; background-color:#FFFFFF; background-image:url("../images/errorLine.gif"); background-position:left bottom; background-repeat:repeat-x; the input value is like "123; 456; 789;". the red line cover all the string, its length is the same as the input width. Is there any way to make the red line only under the "456;"? Is there anyway to do it by CSS? Thanks a lot. Best regards, Ryanivanka

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• SEO URL Structure

  - by Neil

  Based on the following example URL structure: mysite.com/mypage.aspx?a=red&b=green&c=blue Pages in the application use ASP.net user controls and some of these controls build a query string. To prevent duplicate keys being created e.g. &pid=12&pid=10, I am researching methods of rewriting the URL: a) mysite.com/mypage.aspx/red/green/blue b) mysite.com/mypage.aspx?controlname=a,red|b,green|c,blue Pages using this structure would be publishing content that I would like to get indexed and ranked - articles and products (8,000 products to start, with thousands more being added later) My gut instinct tells me to go with the first method, but would it would be overkill to add all that infrastructure if the second method will accomplish my goal of getting pages indexed AND ranked. So my question, looking at the pro's and con's, Google Ranking, time to implement etc. which method should I use? Thanks!

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• Tkinter mouse event initially triggered

  - by user3714884

  I'm currently learning Tkinter and I cannot find a solution for my problem here nor outside Stackoverflow. In a nutshell, all events that I bind to my widgets are triggered initialy and don't respond to my actions. In this example, the red rectangle appears on the canvas when I run the code, and color=random.choice(['red', 'blue']) revealed that the event binding doesn't work after that: import Tkinter as tk class application(tk.Frame): def __init__(self, master=None): tk.Frame.__init__(self, master) self.can = tk.Canvas(master, width=200, height=200) self.can.bind('<Button-2>', self.draw()) self.can.grid() def draw(self): self.can.create_rectangle(50, 50, 100, 100, fill='red') app = application() app.mainloop() I use a Mac platform, but I haven't got a clue about its role in the problem. Could anyone please point me at the mistake i did here?

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• Navigation Bar color doesn't change back? iOS7

  - by TKP

  I have several tableviews with navigation controller. The navigation bar is white for all the views except the last one, which is red. I have [[[self navigationController] navigationBar] setTintColor:[UIColor redColor]; in the viewDidLoad of the last tableview and [[[self navigationController] navigationBar] setTintColor:[UIColor whiteColor]; in the viewDidLoad of other table views. It works fine until I get to the last view and the color of the navigation bar changes to red. When I go back to the previous views, all the previous views' navigation bar has changed to red. Where should I put those codes so the color will remain unchanged? Thanks,

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• In Perl, how can I iterate over the Cartesian product of multiple sets?

  - by nubie2

  I want to do permutation in Perl. For example I have three arrays: ["big", "tiny", "small"] and then I have ["red", "yellow", "green"] and also ["apple", "pear", "banana"]. How do I get: ["big", "red", "apple"] ["big", "red", "pear"] ..etc.. ["small", "green", "banana"] I understand this is called permutation. But I am not sure how to do it. Also I don't know how many arrays I can have. There may be three or four, so I don't want to do nested loop.

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• How do I create static instances of a class inside that class?

  - by wehas

  I have a class Color that holds values for the red, green, and blue channels of a color. The class constructor lets you create a new color by specifying values for the three channels. However, for convenience, I would also like to have some "premade" colors available for the programmer. For example instead of having something like DrawRectangle(new Color(1, 0, 0)); you would be able to say DrawRectangle(Color.Red); Where Color.Red is an instance of Color that lives inside the Color class. How can I declare these instances of Color inside the Color class? If there is a name for this type of technique I'd like to know it as I had no idea what search terms to use when I was looking for help online.

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• How can I hide a property from going into the form designer file?

  - by user460334

  I am working in VB.NET 2010 Framework 2.0. I don't want to allow some properties from going into form's designer file but the those properties will present on the form(property grid). The behavior of these properties will be same always. I used the following code: <DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)> Public Property GradientBegin() As Color = Color.Red But the problem I am facing is that - on the property grid after changing the "GradientBegin" color to other than RED and compiling the program, it is replacing the new changed value to RED again. So I am not able to change the color actually. How can I achieve this? Thanks for any reply in advance.

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• Sending mail from html through php will return to php page. It should be in the same contact form. How to do it?

  - by Ershad

  Hi, I have a html page with all images and other text. Below i have the contact form. i am new to php. I have used php to send mail. But when i click on send button,it is going to backend.php. And i have a blank page. What i need is it should in the same page. I have done some javascript to show and hide div's. With this i am showing a thank u msg in the same page. But i dont want to redirect browser to show it is going to backend.php.TO be in the same page i have redirected php to another window. My code is - backend.php <?php if($_POST['message']) { $body = "Name: ".$_POST['name']; $body .= "<br>Email: ".$_POST['email']; $body .= "<br>Phone/Mobile: ".$_POST['phone'] $body .= "<br>Address: ".$_POST['address'] $body .= "<br>Message: ".$_POST['msg'] if(mail("[email protected]","Subjects",$body)) echo 'true'; else echo 'false;'; } ?> form code - <form onsubmit="return validateFormOnSubmit(this)" action="backend.php" method="post" target="_blank"> <table align="left"> <tbody> <tr> <td align="left"><label for="name">Enter your name:</label> <label style="color:red;display:none;font-size:18px;" Id="namestar">*</label></td> </tr> <tr><td align="left"><input Id="name" name="name" style="width:515px;" size="35" maxlength="50" type="text"></td></tr> <tr ><td height="12px"/></tr> <tr> <td align="left"><label for="email">Email Address:</label> <label style="color:red;display:none;font-size:18px;" Id="emailstar">*</label></td> </tr> <tr><td align="left"><input Id="email" name="email" style="width:515px;" type="text"></td></tr> <tr><td height="12px"/></tr> <tr> <td align="left"><label for="phone">Phone/Mobile:</label><label style="color:red;font-size:18px;display:none;" Id="phonestar">*</label></td> </tr> <tr><td align="left"><input Id="phone" name="phone" style="width:515px;" type="text"></td></tr> <tr><td height="12px"/></tr> <tr> <td align="left"><label for="address">Your Address:</label><label style="color:red;font-size:18px;display:none;" Id="addressstar">*</label></td> </tr> <tr><td align="left"><input id="address" name="address" style="width:515px;" type="text"></td></tr> <tr><td height="12px"/></tr> <tr> <td align="left"><label for="msg">Enter Your Comments / Suggestions / Enquiries</label><label style="color:red;font-size:18px;display:none;" Id="messagestar">*</label></td> </tr> <tr><td align="left"><textarea id="msg" name="msg" style="width:515px;height:100px;" type="text"></textarea></td></tr> <tr><td height="12px"/></tr> <tr> <td align="right"><table align="left"> <tbody> <tr > <td style="width:160px;"/> <td style="width:250px;" ><label Id="mandatory" style="display:none;color:red;" >* Mandatory fields</label></td> <td ><input type="submit" name="send" value="send" /></td><td > <input type="reset" name="reset" value="reset" onclick="resetAll()" /></td></tr> </tbody> </table> </td> </tr> </tbody> </table>

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• I'm looking for a blend mode that gives 'realistic' paint colors. (Subtractive)

  - by almosnow

  I've been looking for a blend mode to (well ...) blend two RGB pixels in order to build colors in the samw way that a painter builds them (i.e: subtractive). Here are quick examples of the type of results that I'm expecting: CYAN + MAGENTA = BLUE CYAN + YELLOW = GREEN MAGENTA + YELLOW = RED RED + YELLOW = ORANGE RED + BLUE = PURPLE YELLOW + BLUE = GREEN I'm looking for a formula, like: dest_red = first_red + second_red; dest_green = first_green + second_green; dest_blue = first_blue + second_blue; I've tried with the commonly used 'multiply' formula but it doesn't work; I've tried with custom made formulas but I'm still not able to 'crack' how it should work. And I know already a lot of color theory so please refrain from answers like: Check this link: http://the_difference_betweeen_additive_and_subtractive_lightning.html

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